#链式赋值
# a = b = 10
# print(a)
# print(b)

#多元赋值
# a = 10
# b = 20
# a,b = b,a
# print(a,b)

#复合赋值
#'+=' '-=' '*=' '/='

# a = 1
# a += 1
# print(a)

#py中不能用前置++和后置++
